4 letters
- smut8
- snib8
- snub9
- some7
- sorb7
- sore4
- sori4
- sour5
- spue8
- spur8
- sris4
- stem7
- stir4
- stub8
- stum8
- suba8
- subs8
- sued6
- suer5
- sues5
- suet5
- suit5
- sumo8
- sump11
- sums8
- supe8
- sura5
- surd6
- sure5
- surf8
- swim10
- swum11
- term7
- tier4
- ties4
- time7
- tire4
- trim7
- true5
- tube8
- tubs8
- tuis5
- ukes9
- umbo11
- umps11
- unbe9
- urbs8
- urds6
- urea5
- urge7
- uric8
- urns6
- ursa5
- urus6
- used6
- user5
- uses5
- verb11
- vibe11
- vier8
- vies8
- vims11
- vise8
- webs10
- weir7
- wire7
- wise7
- zebu17